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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2575351584e6c8764d3843835477e38ac1cf85aeeac4f501d93bc8dd5c8c34b6' 
  AND token = 'LkmzBMKld8q2vIVtKk9fYyinSlYFxNU+7LPbgrhOohE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}